Deci...
(La primul rand)
x=200000
y=12345
z=99999
x+y=?
x+y=200000+12345
x+y=212345
(x+y)-z=?
212345-99999
=112346
(Al doilea rand)
x=?
z=?
y=300000
x+y=901000
x+300000=901000
x=901000-300000
x=601000.
(x+y)-z=799895
(601000-300000)-z=799895
301000-z=799895
z=799895-301000
z=498895
(Al treilea rand)
x=3040
y=?
z=88
x+y=90100
3040+y=90100
y=90100-3040
y=87060
(x+y)-z=?
87060-z=?
87060-88=86972
